...the CS3 is kinda noisy, but it gets the job done...
I've heard this said a lot, but I think there's a bit of a misconception.
I'm very familiar with the CS-3 - inside and out (Bongo sent me a schematic, and I was obscessed since then). Realize that on a stock CS, unity gain is achieved at about 10:00 on the 'sustain' knob, along with noon on the 'level' (they interact, of course, but this 12:00/10:00 setting is a pretty reasonable neutral or baseline setting, with light/medium limiting on a passive bass; tone is neutral at about noon, and something like 1:30 on the attack control gets you pretty tight gain control, without getting blatent intermod distortion, as you would clockwise from there). The way a CS works is that the detector/VCA has a fixed threshold, and as you advance the sustain control clockwise (from 10:00 in this example), you're just 'driving it harder', and increasing gain FAST!
So my point is that by the time you get to noon on the sustain knob, you've really added a lot of gain! I most often run the sustain control at 1:00 or so; this is TONS of compression, and TONS of GAIN (I should measure it one of these days). Enough gain to amplify existing noise, for one thing - but I think it does a pretty quiet job up there, considering all the gain I've induced.
I have more noise trouble, for sure, from my Aphex Bass Xciter.
I mean.. as one compares compressor to compressor - let's say CS-3 to a Funch Factory - here's where a rather unfair comparison comes in: you can say 'the PF is quieter than the CS-3' - but dang - you can hardly 'dial-back' a CS-3 far enough to make it compress as little as a PFactory does cranked up!
See what I mean?
Joe